Corning and Intel crushed the distance record by demonstrating the 25Gb/s transmission of data across 820 meters using multi-mode fiber.

Earlier this month, the companies announced the Corning ClearCurve LX optical fiber optimized for Intel's Silicon Photonics technology that could operate up to 300 meters.

Corning developed a new connector and multimode fiber for the data
center designed to Intel's requirements, that is optimized for Intel
Silicon Photonics (SiPh) Technology. Intel's Silicon Photonic module
together with Corning ClearCurve LX Multimode Fiber can drive cables
as long as 300 meters. The MXC connector, along with Intel Silicon Photonics Technology, can be used in virtually all applications in
the data center, including top-of-rack Ethernet switching, rack-to-
end-of-row, storage interconnects, HPC, cloud computing, big data and
disaggregated computer architectures.

The 300m reach would be able to address future data centers' critical needs for higher line rate transmission over longer distances.

Engineers from Intel and Corning presented the breakthrough at the European Conference on Optical Communications (ECOC) 2013 in London.